I've been struggling with this for some days and have finally succeeded. My experience may help you to get this working too. I got the Mandrake 10 Community Edition DVD from Linux Magazine Issue 34 a few weeks ago.
My system has an Abit BH6 Rev 1.1 BX motherboard with two IDE channels, plus an additional CMD PCI bus IDE card for two extra IDE channels. I had a Windows (95, 98 quadruple booter with Boot Magic) drive on the motherboard promary master, and I tried to install MDK on the drive attached to the primary master channel of the CMD card.
First problem: DVD Boot fails at the first screen to progress to the installer. Solution: create a bootable floppy with the installer on so it bypasses booting from the DVD. See the images folder on DVD for the means to do this.
Second problem: Installation proceeds OK but the disk partitioning stage requires choice of a different drive to the default. Chose the right drive by going for manual partioning and tried to reproduce the partitions that the auto choice made. Result: it worked but when the PC rebooted I just got LI -99 -99 etc. I went off in a sulk and started trawling through the websites for similar sufferers.
Now, the actual problem here is that MDK 10 must have LBA mode access to the hard disk, not "AUTO". The add-on PCI interface card relies on AUTO - there is no choice for you to make. So I swapped the Win98 drive with the MDK drive, so that the MDK drive is now into the motherboard IDE interface, with LBA mode access rather than Auto. A side effect of this is that it became HDA in Linux, rather than HDC. When I rebooted the machine I suddenly saw Lilo! It failed of course because of the changed drive designators, so I cleared the partitions with Partition Manager, and used a Win98 boot disk to clear the Master Boot Record with FDISK /MBR.
This time I used the bootable floppy and made sure that the target hard disk was set up correctly in the BIOS. I did the same installation as before, but this time I let the partitioning use the automatic settings in free space. On reboot, Ta da! Lilo boot loader with new screen, boots into MDK and starts up perfectly, apart from the microphone volume being so high that I nearly blew the place up with feedback. Now I can play with it!
Checklist:
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It's easier to dual boot with physically separate hard drives for OS's, and use BIOS settings if necessary for selection.
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Make sure that the Linux drive is using LBA mode and is set correctly for geometry. I did have to use Auto for Windows, but now Mandrake is installed I switched back to Auto and it still works.
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Make sure that the BIOS is set for non-PnP OS, and that all PCI cards are set for BIOS-selected IRQ and address.
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Unplug the mike before first boot...